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GILBERT MUNDAY, OF MONTEZUMA,` OHIO.

Letters Patent No. 100,312, dated March l', 1870.

IMPROVEMENT n IN SAW- GUMMER.

The Schedule referred to in these Letters Patent and making part of thesame from the machine.

A is the base or. supports on which the frame of my machine rests.

B is the frame-work.

C C, the inner box or frame.

D, the tapering or cone-shaped bur or cutter.

E, the temper or feed-screw.

I I, the detachable blocks. Y

F, the wedge used to hold cross-cut or mill-sa ws up against the gummer.

K, a small slide-box.

This invention consists oi a sawgummer, whose parts are so arranged thatthe cutter or bur can be removed and others of different sizes andshapes used; also, in the peculiar form of the bur or cutter, and itsinner frame or box carrying said cutter, arranged to slide back andforth ou tongues'or ways arranged within the frame B. V

4It further consists in a cutter or bur having both a reciprocating androtary motion while operating upon the saw-tooth, as hereinafter morefully described.

In order to enable those skilled in the art to make and use myinvention, lI will proceed to describe its construction and operation.

A is the base or platform, composed of two beams with cross-pieces a a,in which the frame rests.

B is the frame of my machine, having openings of arch shape on bot-hsides.

On the inner sides of the frameI B, at the top and bottom, are ways ortongues d d, on which the inner fraaie or box O, carrying the cutter D,is arranged to slide.

The frame, B of my machine vhas an' opening, G, through its center forthe recept-ion of the saw, and is held in position upon the saw bytheset-screws b b c c.

The frame B may be taken apart, if necessary, by removing the bolts g gi t jj, used in holding the side pie-ces together, it frequentlybecoming necessary in order to repair the machine.

Arranged on eacli side of the frame B are arms h. h, four in number,which rest on eachside of .the sawblade, and having set screws c c.

Just above the arms h, on one end of the frame B,

are two additional set screws b l, which, if necessary, maybe used tofurther secure the machine 011 the saw. These screws clamp thesaw-blade, and, by their number and arrangement, serve to elfectuallyprevent any wabbling7 or reeling of the tool, during which movementtends to make an irregular edge on the sawtooth.

Above the screws b b is a wedge F used onl when l l b 1 1 gummmgcross-cut or mill-saws, for the purpose ol holding the saw firmly upagainst the cutter D, and is removed when operating upon circular saws.

Toi-king in the frame B is an inner frame lo r box, 0, carrying thegummer or cutter I), said frame having grooves c c, to fit and slideupon the tongues or ways (l d, and operated bythe feed-screw E andhandwheel H. By this means and with my form of cutter any size of toothcan be gunnned without removing the cutter or bur from the machine.

D is the bur or cutter, the cutting edges heilig spiral, bearing at anangle of about ten degrees to axis of the cutter, and which I make oftapering or 'cone shape, which greatly-obviates the necessity ofcha-nging the cutter for-saws of diterent sizes, although, if necessary,there may be several forms or sizes oi' outters, and may be taken outand replaced at the pleasuse of the operator, it frequently beingnecessary to re' move the gummer for sharpening, as it will inconstantuse become dull.

In order to make the cutter easily removable, I form at one end of theframe B blocks I I, which also act as a bearing for the shaft orcrank-end J of the cutter to work, and are removable by means of thebolts g g running through the sideplates of frame B. I use a small boxor journal, K, which supports the smaller end of the cut-ter D, and isintended to be 4used when cutters of smaller size are used.

The operation of my machine is as follows:

The machine isset on the saw by sliding the saw up through the opening Gof the frame B, and is secured or held lirmly to its place by means ofthe screws c c b l). The inner frame orl box C carrying the cutter D isrun back upon the ways or tongues d d by the action of the feed-screw Eand hand-wheel H until the small end of the cutter is over the tooth ofthe saw. Then turn the crank until the frame is drawn the length of thecutter or bur D. Then loosen the set screws c c b b, and slide themachine back to the smaller end of the cutter. Again clamp the saw bymeans of the screws before mentioned, repeating operation until thedesired depth in the tooth is obtained.

My machine can be set so as to out orA gum on a straight or curved linewithout the least danger of breaking any palt of the machine, all thestrain being on the feedscrew and inner frame or box C.

The advantages of my machine overall others `are,

first, the cutter or bnr, which, instead of being drawn directly acrossthe tooth of the saw, is gradually moved lengthwise through the machineand over the tooth of the saw, and, at the same time, having a rotarym0- tion; then, by cutting gradually during its movement until reachingthe end of the cutter, making amore true and much smoother tooth than bythe machines now inuse, and not tending to break the teeth of the saiv,`or dull and injure the cutting-edges of the gummer, as is frequentlythe case ,in gnmming large and heavy saws.

It is believed that by iny arrangement of saw-gumnier a more simple andeiicient device is obtained than those heretofore used, and capable ofbeing more readily manipulated and applied to its work. The device as awhole is very simple and ctiicient, and may be constructed at a smallercost, and Without the liability of getting out of repair', or having anypart deranged by constant use.

Having fully described the construction and operation ot' my machine,

What I desire to claim, and secure by VLetters Patent, is

1. The tapering cutter or bnr D, having its cutting edges arrangedspil-ally or nearly so, when operated substantially as set forth.

2, A cutter or bur, constructed and arranged as described, upon a fralneot' a saw-glimmer, whereby said iuasie cutter may have both a rotary andreciprocating mo' tion while operating upon the saw-tooth.

3. The frame B, having ways d d, in combination with the box or innerframe C C carrying the cutter D, and operated by the feed-screw E,arranged substantially as described.

4. In combination with the inner box or frame C O the removable ordetachable blocks I. I, substantially as described. l 5. The inner frameor box C C, arranged to slide back and forth in the fratrie D, saidframe having removable blocks I I, box or bearing K, and carrying thecutter or bur D, substantially as described.

6. The frame B, having the slot or openin g G, wedge F, arms 7i h, setor clamp-screws b b c c, in conibination with frame O C and cutter D,arranged substantially as described.

7. Frame B, having the opening G, wedge F, arms I h h, set orclamp-screws c c b b, inner frame'or box C C with grooves e e working onthe tongues or iva-ys d d, removable blocks I I, box or bearing K, shaftJ, and feed-screw E, all arranged substantially as de scribed. Y

` GILBERT MUNDAY.

Witnesses:

DAVID H. RICHARDSON, Lewis MoDnRMorr.

